I need to get a list of views that are on certain CGPoint. Using this method:
- (void)handlePan:(UITapGestureRecognizer *)recognizer {
UIView *subview = [recognizer.view hitTest:[recognizer locationInView:recognizer.view] withEvent:nil];
//....
}
gives me only 1 view. Is there any way to get an array of views under the location?
I think you can do something like this:
NSMutableArray *subviewsList = [NSMutableArray new];
for (UIView *subview in self.view.subviews) {
if (CGRectContainsPoint(subview.frame, point) ) {
[subviewsList addObject:subview];
}
}
point is your [recognizer locationInView:recognizer.view]. Assuming, of course, you are running this code inside a viewController.
I have been following this tutorial on integrating UIKit with a CCLayer. Basically all I want to do is to add gesture recognizers handlers to my layer and trigger my game actions according to those.
However I do have a problem (which doesn't seem new) as the CCMenu items I added to the layer are not absorbing the clicks/taps.
In brief: I do have a layer where I integrated all the code suggested by Ray and it works perfectly except that the CCMenu doesn't absorbe clicks.
I read the post but I am not quiet comfortable with the idea of modifying CCNode and adding the method to verify if the touch is in space etc..
I thought that the easier way (for me) would be to just pass the touch on the CCMenu if the touch is over the CCMenu area.
Here a code snippet:
- (void)handleTap:(UITapGestureRecognizer *)tapRecognizer{
UIView * view = [[CCDirector sharedDirector] view];
CGPoint point = [self convertYTouch:[tapRecognizer locationInView:view] ];
if (CGRectContainsPoint([pauseMenu boundingBox], point)) {
[myMenu HowDoIPassTheTouchToTheMenu]
}
else{
//Handle single tap
}
}
Any idea on how I can pass the touch to the menu?
I tried to play around with TouchDispatcher and priority but can't get it to work.
EDIT: I wrote this method but doesn't seem to help much
-(void) activateItemForTouch:(CGPoint)point
{
if( state_ != kCCMenuStateWaiting || !visible_ || ! enabled_)
return;
for( CCNode *c = self.parent; c != nil; c = c.parent )
if( c.visible == NO )
return;
CCLOG(#"in activate item for touch");
selectedItem_ = [self itemForTouchLocation:point];
[selectedItem_ selected];
[selectedItem_ unselected];
[selectedItem_ activate];
state_ = kCCMenuStateWaiting;
}
-(CCMenuItem *) itemForTouchLocation: (CGPoint) touchLocation
{
touchLocation = [[CCDirector sharedDirector] convertToGL: touchLocation];
CCMenuItem* item;
CCARRAY_FOREACH(children_, item){
// ignore invisible and disabled items: issue #779, #866
if ( [item visible] && [item isEnabled] ) {
CGPoint local = [item convertToNodeSpace:touchLocation];
CGRect r = [item rect];
r.origin = CGPointZero;
if( CGRectContainsPoint( r, local ) )
return item;
}
}
return nil;
}
EDIT BIS:
I also tried to implement the UIGestureRecognizerDelegate protocol but even if I set gestureRecognizer to FALSE it never passes the gesture/touch to the menu.
-(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
CCLOG(#"should receive");
return FALSE;
}
I have a custom UIButton with UILabel added as subview. Button perform given selector only when I touch it about 15points lower of top bound. And when I tap above that area nothing happens.
I found out that it hasn't caused by wrong creation of button and label, because after I shift the button lower at about 15 px it works correctly.
UPDATE I forgot to say that button located under the UINavigationBar and 1/3 of upper part of the button don't get touch events.
Image was here
View with 4 buttons is located under the NavigationBar. And when touch the "Basketball" in top, BackButton get touch event, and when touch "Piano" in top, then rightBarButton (if exists) get touch. If not exists, nothing happened.
I didn't find this documented feature in App docs.
Also I found this topic related to my problem, but there is no answer too.
I noticed that if you set userInteractionEnabled to OFF, the NavigationBar doesn't "steal" the touches anymore.
So you have to subclass your UINavigationBar and in your CustomNavigationBar do this:
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
if ([self pointInside:point withEvent:event]) {
self.userInteractionEnabled = YES;
} else {
self.userInteractionEnabled = NO;
}
return [super hitTest:point withEvent:event];
}
Info about how to subclass UINavigationBar you can find here.
I found out the answer here(Apple Developer Forum).
Keith at Apple Developer Technical Support, on 18th May 2010 (iPhone OS 3):
I recommend that you avoid having touch-sensitive UI in such close proximity to the nav bar or toolbar. These areas are typically known as "slop factors" making it easier for users to perform touch events on buttons without the difficulty of performing precision touches. This is also the case for UIButtons for example.
But if you want to capture the touch event before the navigation bar or toolbar receives it, you can subclass UIWindow and override:
-(void)sendEvent:(UIEvent *)event;
Also I found out,that when I touch the area under the UINavigationBar, the location.y defined as 64,though it was not.
So I made this:
CustomWindow.h
#interface CustomWindow: UIWindow
#end
CustomWindow.m
#implementation CustomWindow
- (void) sendEvent:(UIEvent *)event
{
BOOL flag = YES;
switch ([event type])
{
case UIEventTypeTouches:
//[self catchUIEventTypeTouches: event]; perform if you need to do something with event
for (UITouch *touch in [event allTouches]) {
if ([touch phase] == UITouchPhaseBegan) {
for (int i=0; i<[self.subviews count]; i++) {
//GET THE FINGER LOCATION ON THE SCREEN
CGPoint location = [touch locationInView:[self.subviews objectAtIndex:i]];
//REPORT THE TOUCH
NSLog(#"[%#] touchesBegan (%i,%i)", [[self.subviews objectAtIndex:i] class],(NSInteger) location.x, (NSInteger) location.y);
if (((NSInteger)location.y) == 64) {
flag = NO;
}
}
}
}
break;
default:
break;
}
if(!flag) return; //to do nothing
/*IMPORTANT*/[super sendEvent:(UIEvent *)event];/*IMPORTANT*/
}
#end
In AppDelegate class I use CustomWindow instead of UIWindow.
Now when I touch area under navigation bar, nothing happens.
My buttons still don't get touch events,because I don't know how to send this event (and change coordinates) to my view with buttons.
Subclass UINavigationBar and add this method. It will cause taps to be passed through unless they are tapping a subview (such as a button).
-(UIView*) hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
UIView *v = [super hitTest:point withEvent:event];
return v == self? nil: v;
}
The solution for me was the following one:
First:
Add in your application (It doesn't matter where you enter this code) an extension for UINavigationBar like so:
The following code just dispatch a notification with the point and event when the navigationBar is being tapped.
extension UINavigationBar {
open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "tapNavigationBar"), object: nil, userInfo: ["point": point, "event": event as Any])
return super.hitTest(point, with: event)
}
}
Then in your specific view controller you must listen to this notification by adding this line in your viewDidLoad:
NotificationCenter.default.addObserver(self, selector: #selector(tapNavigationBar), name: NSNotification.Name(rawValue: "tapNavigationBar"), object: nil)
Then you need to create the method tapNavigationBar in your view controller as so:
func tapNavigationBar(notification: Notification) {
let pointOpt = notification.userInfo?["point"] as? CGPoint
let eventOpt = notification.userInfo?["event"] as? UIEvent?
guard let point = pointOpt, let event = eventOpt else { return }
let convertedPoint = YOUR_VIEW_BEHIND_THE_NAVBAR.convert(point, from: self.navigationController?.navigationBar)
if YOUR_VIEW_BEHIND_THE_NAVBAR.point(inside: convertedPoint, with: event) {
//Dispatch whatever you wanted at the first place.
}
}
PD: Don't forget to remove the observation in the deinit like so:
deinit {
NotificationCenter.default.removeObserver(self)
}
That's it... That's a little bit 'tricky', but it's a good workaround for not subclassing and getting a notification anytime the navigationBar is being tapped.
I just wanted to share another prospective to solving this problem. This is not a problem by design, but it was meant to help user get back or navigate. But we need to put things tightly in or below nav bar and things look sad.
First lets look at the code.
class MyNavigationBar: UINavigationBar {
private var secondTap = false
private var firstTapPoint = CGPointZero
override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
if !self.secondTap{
self.firstTapPoint = point
}
defer{
self.secondTap = !self.secondTap
}
return super.pointInside(firstTapPoint, withEvent: event)
}
}
You might be see why am i doing second touch handling. There is the recipe to the solution.
Hit test is called twice for a call. The first time the actual point on the window is reported. Everything goes well. On the second pass, this happens.
If system sees a nav bar and the hit point is around 9 pixels more on Y side, it tries to decrease that gradually to below 44 points which is where the nav bar is.
Take a look at the screen to be clear.
So theres a mechanism that will use nearby logic to the second pass of hittest. If we can know its second pass and then call the super with first hit test point. Job done.
The above code does that exactly.
There are 2 things that might be causing problems.
Did you try setUserInteractionEnabled:NO for the label.
Second thing i think might work is apart from that after adding label on top of button you can send the label to back (it might work, not sure although)
[button sendSubviewToBack:label];
Please let me know if the code works :)
Your labels are huge. They start at {0,0} (the left top corner of the button), extend over the entire width of the button and have a height of the entire view. Check your frame data and try again.
Also, you have the option of using the UIButton property titleLabel. Maybe you are setting the title later and it goes into this label rather than your own UILabel. That would explain why the text (belonging to the button) would work, while the label would be covering the rest of the button (not letting the taps go through).
titleLabel is a read-only property, but you can customize it just as your own label (except perhaps the frame) including text color, font, shadow, etc.
This solved my problem..
I added hitTest:withEvent: code to my navbar subclass..
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
int errorMargin = 5;// space left to decrease the click event area
CGRect smallerFrame = CGRectMake(0 , 0 - errorMargin, self.frame.size.width, self.frame.size.height);
BOOL isTouchAllowed = (CGRectContainsPoint(smallerFrame, point) == 1);
if (isTouchAllowed) {
self.userInteractionEnabled = YES;
} else {
self.userInteractionEnabled = NO;
}
return [super hitTest:point withEvent:event];
}
Extending Alexander's solution:
Step 1. Subclass UIWindow
#interface ChunyuWindow : UIWindow {
NSMutableArray * _views;
#private
UIView *_touchView;
}
- (void)addViewForTouchPriority:(UIView*)view;
- (void)removeViewForTouchPriority:(UIView*)view;
#end
// .m File
// #import "ChunyuWindow.h"
#implementation ChunyuWindow
- (void) dealloc {
TT_RELEASE_SAFELY(_views);
[super dealloc];
}
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (UIEventSubtypeMotionShake == motion
&& [TTNavigator navigator].supportsShakeToReload) {
// If you're going to use a custom navigator implementation, you need to ensure that you
// implement the reload method. If you're inheriting from TTNavigator, then you're fine.
TTDASSERT([[TTNavigator navigator] respondsToSelector:#selector(reload)]);
[(TTNavigator*)[TTNavigator navigator] reload];
}
}
- (void)addViewForTouchPriority:(UIView*)view {
if ( !_views ) {
_views = [[NSMutableArray alloc] init];
}
if (![_views containsObject: view]) {
[_views addObject:view];
}
}
- (void)removeViewForTouchPriority:(UIView*)view {
if ( !_views ) {
return;
}
if ([_views containsObject: view]) {
[_views removeObject:view];
}
}
- (void)sendEvent:(UIEvent *)event {
if ( !_views || _views.count == 0 ) {
[super sendEvent:event];
return;
}
UITouch *touch = [[event allTouches] anyObject];
switch (touch.phase) {
case UITouchPhaseBegan: {
for ( UIView *view in _views ) {
if ( CGRectContainsPoint(view.frame, [touch locationInView:[view superview]]) ) {
_touchView = view;
[_touchView touchesBegan:[event allTouches] withEvent:event];
return;
}
}
break;
}
case UITouchPhaseMoved: {
if ( _touchView ) {
[_touchView touchesMoved:[event allTouches] withEvent:event];
return;
}
break;
}
case UITouchPhaseCancelled: {
if ( _touchView ) {
[_touchView touchesCancelled:[event allTouches] withEvent:event];
_touchView = nil;
return;
}
break;
}
case UITouchPhaseEnded: {
if ( _touchView ) {
[_touchView touchesEnded:[event allTouches] withEvent:event];
_touchView = nil;
return;
}
break;
}
default: {
break;
}
}
[super sendEvent:event];
}
#end
Step 2: Assign ChunyuWindow instance to AppDelegate Instance
Step 3: Implement touchesEnded:widthEvent: for view with buttons, for example:
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesEnded: touches withEvent: event];
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView: _buttonsView]; // a subview contains buttons
for (UIButton* button in _buttons) {
if (CGRectContainsPoint(button.frame, point)) {
[self onTabButtonClicked: button];
break;
}
}
}
Step 4: call ChunyuWindow's addViewForTouchPriority when the view we care about appears, and call removeViewForTouchPriority when the view disappears or dealloc, in viewDidAppear/viewDidDisappear/dealloc of ViewControllers, so _touchView in ChunyuWindow is NULL, and it is the same as UIWindow, having no side effects.
An alternative solution that worked for me, based on the answer provided by Alexandar:
self.navigationController?.barHideOnTapGestureRecognizer.enabled = false
Instead of overriding the UIWindow, you can just disable the gesture recogniser responsible for the "slop area" on the UINavigationBar.
Give a extension version according to Bart Whiteley. No need to subclass.
#implementation UINavigationBar(Xxxxxx)
- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
UIView *v = [super hitTest:point withEvent:event];
return v == self ? nil: v;
}
#end
The following worked for me:
self.navigationController?.isNavigationBarHidden = true
I am using - (void) touchesMoved to do stuff when ever I enter a specific frame, in this case the area of a button.
My problem is, I only want it to do stuff when I enter the frame - not when I am moving my finger inside the frame.
Does anyone know how I can call my methods only once while I am inside the frame, and still allow me to call it once again if I re-enter it in the same touchMove.
Thank you.
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event touchesForView:self.view] anyObject];
CGPoint location = [touch locationInView:touch.view];
if(CGRectContainsPoint(p1.frame, location))
{
//I only want the below to me called
// once while I am inside this frame
[self pP01];
[p1 setHighlighted:YES];
}else {
[p1 setHighlighted:NO];
}
}
You can use some attribute to check if the code was already called when you were entering specific area. It looks like highlighted state of p1 object (not sure what it is) may be appropriate for that:
if(CGRectContainsPoint(p1.frame, location))
{
if (!p1.isHighlighted){ // We entered the area but have not run highlighting code yet
//I only want the below to me called
// once while I am inside this frame
[self pP01];
[p1 setHighlighted:YES];
}
}else { // We left the area - so we'll call highlighting code when we enter next time
[p1 setHighlighted:NO];
}
Simply add a BOOL that you check in touchesMoved and reset in touchesEnded
if( CGRectContainsPoint([p1 frame],[touch locationInView:self.view])) {
NSLog (#"Touch Moved over p1");
if (!p14.isHighlighted) {
[self action: p1];
p1.highlighted = YES;
}
}else {
p1.highlighted = NO;
}
try using a UIButton and use the 'touch drag enter' connection in Interface Builder.
I have UIScrollView which has subviews (pictures) added do it. each time a user touches the a picture in the scrollview, it toggles a checkmark ontop of it.
NSMutableIndexSet *picturesArray; <- declared in .h
- (void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event {
if (!self.dragging) {
[self.nextResponder touchesEnded: touches withEvent:event];
NSLog(#"Touch down");
for (UITouch *touch in touches) {
for (int i = 1; i <= [self subviews].count; i++)
{
if(CGRectContainsPoint([[self viewWithTag:i]frame], [touch locationInView:self])){
NSLog(#"touched %d th view",i);
NSArray *subviews = [[self viewWithTag:i] subviews];
UIImageView *view = nil;
view = [subviews objectAtIndex:0];
if(view.hidden){
// add the index
[picturesArray addIndex:i];
view.hidden = NO; //check mark is shown
}else{
[picturesArray removeIndex:i];
view.hidden = YES; //check mark is not shown
}
// UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:i]image], nil, nil, nil); <- WORKS IF CALLED
}
}
}
}
Question 1: is this the best way of doing this? It seems like using a for (int i = 1; i <= [self subviews].count; i++) is pretty slow. I basically need to capture which subview was touched. I havent figured this out other than going through EACH subview
savePhotos is called and basically searches through which of the pictures was touched and saves them to the Photo Album. However the call to UIImageWriteToSavedPhotosAlbum fails. This is in the same file as TouchesEnded. But when called in TouchesEnded, it works.
(IBAction) savePhotos: (id) sender{
NSLog(#"The index set is %#",picturesArray );
const NSUInteger arrayCount = picturesArray.count;
NSUInteger *theIndexBuffer = (NSUInteger *)calloc(picturesArray.count, sizeof(NSUInteger));
UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:0]image], nil, nil, nil);
[picturesArray getIndexes:theIndexBuffer maxCount:arrayCount inIndexRange:nil];
for(int i = 0; i < arrayCount; i ++){
NSLog(#"Element is %d",theIndexBuffer[i]);
UIImageWriteToSavedPhotosAlbum([(UIImageView *)[self viewWithTag:i]image], nil, nil, nil); <- THIS CRASHES
}
}
Question 2: Why is it that UIImageWriteToSavedPhotosAlbum is failing ?
1) instead of using UIImageView, implement a child of UIImageView. Then try listening for touches on the individual subviews, that should solve your O(n) problem
2) something is probably getting auto-released, double check your reference counting is correct
try UIView* targetView = [self hitTest:location withEvent:nil];